electromagnetism

What is magnetism?

Magnetism is the force displayed by magnets which allows materials to repel or attract.

Define magnetic domains.

Magnetic domains are areas within a material where the magnetic fields of atoms are aligned in the same direction, making the material magnetized.

What happens to magnetic domains in an unmagnetized material?

In an unmagnetized material, the magnetic domains are pointing in random directions.

What is a permanent magnet?

A permanent magnet is a material that keeps its magnetic properties over time and always has a south and north pole.

What is an electromagnet?

An electromagnet is a type of magnet that becomes magnetic when an electric current flows through it and loses magnetism when the current is turned off.

What is the relationship between electric currents and magnetic fields?

Electric currents produce magnetic fields, and changing magnetic fields can produce electric currents.

What are the three ways to make an electromagnet stronger?

1. More turns on the coil; 2. More electrical current; 3. Using an iron core.

Describe a parallel circuit.

A parallel circuit has two or more paths for current to flow through, current is divided, and voltage is constant.

What is the effect of higher resistance in a circuit?

Higher resistance results in lower current.

What occurs during a short circuit?

In a short circuit, electric current flows down the wrong or unintended path with little to no electrical resistance, resulting in very low voltage and high current.